My CLS 53 has indigestion
But one thing that has jumped out to me (and everyone that has ridden in it with me) is its tendency to BURP at every transmission up-shift. It's really noticeable - even with the windows up - that the exhaust let's out an obvious little toot every time it shifts up. My kids laughed at it and asked me why the car was "farting"

I have the stock exhaust (did not opt for the upgrade of an AMG exhaust).
any thoughts?
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